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langgraph: handle node return annotations with unions (#3170)

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This commit is contained in:
Vadym Barda
2025-01-23 14:41:22 -05:00
committed by GitHub
parent 39552255c8
commit 1059ef55d1
1 changed files with 21 additions and 8 deletions
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libs/langgraph/langgraph/graph/state.py
+21 -8
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@@ -379,14 +379,27 @@ class StateGraph(Graph):
if input_hint := hints.get(first_parameter_name):
if isinstance(input_hint, type) and get_type_hints(input_hint):
input = input_hint
if (
(rtn := hints.get("return"))
and get_origin(rtn) is Command
and (rargs := get_args(rtn))
and get_origin(rargs[0]) is Literal
and (vals := get_args(rargs[0]))
):
ends = vals
if rtn := hints.get("return"):
# Handle Union types
rtn_origin = get_origin(rtn)
if rtn_origin is Union:
rtn_args = get_args(rtn)
# Look for Command in the union
for arg in rtn_args:
arg_origin = get_origin(arg)
if arg_origin is Command:
rtn = arg
rtn_origin = arg_origin
break
# Check if it's a Command type
if (
rtn_origin is Command
and (rargs := get_args(rtn))
and get_origin(rargs[0]) is Literal
and (vals := get_args(rargs[0]))
):
ends = vals
except (TypeError, StopIteration):
pass
if input is not None: